HII Region Temperature Structure

[Poppop]

I'm trying to use Osterbrock's book "Astrophysics of Gaseous Nebulae and Active Galacic Nuclei" to made a model of a pure Hydrogen HII region. I've got the ionization structure down, but I'm having trouble with the temperature. Can anyone recommend somewhere that shows what I should be getting?

 

[Astronuc]

An ionized hydrogen (HII) region (T about 10^4 K) at radio wavelengths (6 cm). from
http://www.astro.queensu.ca/~irwin/phy215/y2002/notes.html

Considering that 1 eV is roughly equivalent to 11605 K, then 13.6 eV is about 157K. Think of what EM energies are detected from HII regions.

Oh I dislike doing this but - http://en.wikipedia.org/wiki/H_II_region#Physical_characteristics

http://www.cv.nrao.edu/course/astr534/HIIRegions.html

http://csep10.phys.utk.edu/astr162/lect/stars/spectra.html

 

[Poppop]

But the ionization doesn't have much to do with the temperature, since the hydrogen is being ionized by the photons over 13.6, not collisionally. Doesn't the temperature come from the excess energy (over 13.6) from the photons?

 

[malawi_glenn]

I'm trying to use Osterbrock's book "Astrophysics of Gaseous Nebulae and Active Galacic Nuclei" to made a model of a pure Hydrogen HII region. I've got the ionization structure down, but I'm having trouble with the temperature. Can anyone recommend somewhere that shows what I should be getting?

http://www.astro.uu.se/~ke/summ9.pdf

page 4 and 5

This is what I can contribute:P

 

[Astronuc]

But the ionization doesn't have much to do with the temperature, since the hydrogen is being ionized by the photons over 13.6, not collisionally. Doesn't the temperature come from the excess energy (over 13.6) from the photons?

The fact that all the sources mention that the temperature of the HII region is on the order of 10⁴ K indicates that the electron (and perhaps ion) energy is about 1 eV. And I imagine there is some kind distribution of energy/temperature.